1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 1999-2007 Shigeru Chiba. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.expr;
import javassist.*;
import javassist.bytecode.*;
import javassist.compiler.*;
/**
* Catch clause.
*/
public class Handler extends Expr {
private static String EXCEPTION_NAME = "$1";
private ExceptionTable etable;
private int index;
/**
* Undocumented constructor. Do not use; internal-use only.
*/
protected Handler(ExceptionTable et, int nth,
CodeIterator it, CtClass declaring, MethodInfo m) {
super(et.handlerPc(nth), it, declaring, m);
etable = et;
index = nth;
}
/**
* Returns the method or constructor containing the catch clause.
*/
public CtBehavior where() { return super.where(); }
/**
* Returns the source line number of the catch clause.
*
* @return -1 if this information is not available.
*/
public int getLineNumber() {
return super.getLineNumber();
}
/**
* Returns the source file containing the catch clause.
*
* @return null if this information is not available.
*/
public String getFileName() {
return super.getFileName();
}
/**
* Returns the list of exceptions that the catch clause may throw.
*/
public CtClass[] mayThrow() {
return super.mayThrow();
}
/**
* Returns the type handled by the catch clause.
*/
public CtClass getType() throws NotFoundException {
ConstPool cp = getConstPool();
String name = cp.getClassInfo(etable.catchType(index));
return Descriptor.toCtClass(name, thisClass.getClassPool());
}
/**
* This method has not been implemented yet.
*
* @param statement a Java statement.
*/
public void replace(String statement) throws CannotCompileException {
throw new RuntimeException("not implemented yet");
}
/**
* Inserts bytecode at the beginning of the catch clause.
* The caught exception is stored in <code>$1</code>.
*
* @param src the source code representing the inserted bytecode.
* It must be a single statement or block.
*/
public void insertBefore(String src) throws CannotCompileException {
edited = true;
ConstPool cp = getConstPool();
CodeAttribute ca = iterator.get();
Javac jv = new Javac(thisClass);
Bytecode b = jv.getBytecode();
b.setStackDepth(1);
b.setMaxLocals(ca.getMaxLocals());
try {
CtClass type = getType();
int var = jv.recordVariable(type, EXCEPTION_NAME);
jv.recordReturnType(type, false);
b.addAstore(var);
jv.compileStmnt(src);
b.addAload(var);
int oldHandler = etable.handlerPc(index);
b.addOpcode(Opcode.GOTO);
b.addIndex(oldHandler - iterator.getCodeLength()
- b.currentPc() + 1);
maxStack = b.getMaxStack();
maxLocals = b.getMaxLocals();
int pos = iterator.append(b.get());
iterator.append(b.getExceptionTable(), pos);
etable.setHandlerPc(index, pos);
}
catch (NotFoundException e) {
throw new CannotCompileException(e);
}
catch (CompileError e) {
throw new CannotCompileException(e);
}
}
}
|
